dyncache : what is this and used for ?

Hey @Laurent !  Great question.

The reason we don’t have much documented is because it’s not a CV service, it’s a Microsoft service.

 dyncache is the Microsoft Windows Dynamic Cache Service and this was created by MS to address a Memory Cache issue that could occur in 64-bit systems running earlier Windows versions.  Essentially, excessive Read IO on the Cache could cause it to grow and consume the available physical memory.  To address this issue Microsoft created and deployed the dyncache process.

According to Microsoft, "The Microsoft Windows Dynamic Cache Service will manage the working set size of the Windows System File Cache. For 64 bit systems this service helps to address the problem of excessive cached read I/O that could eventually consume all of physical memory. Sample source code and compiled files are included in the compressed file."

In Windows Server 2012 and newer this issue has been addressed on backend by Microsoft.  According to their documentation, "The problem used to be mitigated by dyncache tool. In Windows Server 2012, the architecture has been redesigned and this problem should no longer exist."

As a proactive measure we began including the dyncache installer in our Simpana Installer to prevent this Cache issue from occurring.  As Windows 2012 was given new architecture to no longer experience this issue, the dyncache service will not have any affect.  I did do some digging and did not locate any information indicating there could be any issues with having the service in place on Windows 2012 and I believe this can be safely ignored.

Here’s some links below to the Documentation from Microsoft.

Microsoft Windows Dynamic Cache Service:
https://www.microsoft.com/en-us/download/details.aspx?id=9258


Cache and Memory Manager Potential Performance Issues:
https://msdn.microsoft.com/en-us/library/windows/hardware/dn567645(v=vs.85).aspx

Let me know if you have any further question!